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i2c: rk3x: fix bug that cause transfer fails in master receive mode 

In rk3x SOC, the I2C controller can receive/transmit up to 32 bytes data
in one chunk, so the size of data to be write/read to/from TXDATAx/RXDATAx
must be less than or equal 32 bytes at a time.

Tested on rk3288-pinky board, elan receive 158 bytes data.

Signed-off-by: Addy Ke <addy.ke@rock-chips.com>
Acked-by: Max Schwarz <max.schwarz@online.de>
Reviewed-by: Doug Anderson <dianders@chromium.org>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Cc: stable@kernel.org
This commit is contained in:
addy ke 2014-08-23 02:00:52 +08:00 committed by Wolfram Sang
parent 6721f28a26
commit 5da4309f9e
1 changed files with 4 additions and 0 deletions
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4
drivers/i2c/busses/i2c-rk3x.c
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@ -323,6 +323,10 @@ static void rk3x_i2c_handle_read(struct rk3x_i2c *i2c, unsigned int ipd)
/* ack interrupt */
i2c_writel(i2c, REG_INT_MBRF, REG_IPD);
/* Can only handle a maximum of 32 bytes at a time */
if (len > 32)
len = 32;
/* read the data from receive buffer */
for (i = 0; i < len; ++i) {
if (i % 4 == 0)